Nonequilibrium transport through a Kondo dot in a magnetic field: perturbation theory and poor man's scaling |
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Authors: | Rosch A Paaske J Kroha J Wölfle P |
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Institution: | Institut für Theorie der Kondensierten Materie, Universit?t Karlsruhe, D-76128 Karlsruhe, Germany. |
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Abstract: | We consider electron transport through a quantum dot described by the Kondo model in the regime of large transport voltage V in the presence of a magnetic field B with max((V,B)>T(K). The electric current I and the local magnetization M are found to be universal functions of V/T(K) and B/T(K), where T(K) is the equilibrium Kondo temperature. We present a generalization of the perturbative renormali-zation group to frequency dependent coupling functions, as necessitated by the structure of bare perturbation theory. We calculate I and M within a poor man's scaling approach and find excellent agreement with experiment. |
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